I used to watch a lot of Rhythm Roulette for inspiration, still come back to it sometimes. Must have seen the 9th Wonder, Black Milk and Hi-Tek ones at least 20 times. Other than that, mostly just whatever gets me curious from channels like Tantacrul, Lindybeige, Technology Connections, the list goes on.
I also use YouTube to preview records I find on Discogs and add them to my wishlist if there's any fire. When I'm out digging I just pull out my phone and quickly check if Cool Looking Record #2598 is actually something I've been looking for (after so much stuff it's easy to forget which are which).